diff --git a/external/bsd/fetch/lib/Makefile b/external/bsd/fetch/lib/Makefile
index 48a79881b40b..0b0a278ab421 100644
--- a/external/bsd/fetch/lib/Makefile
+++ b/external/bsd/fetch/lib/Makefile
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.15 2019/10/13 07:28:05 mrg Exp $
+# $NetBSD: Makefile,v 1.16 2020/02/08 00:11:18 kamil Exp $
 
 LIB=		fetch
 SRCS=		fetch.c common.c ftp.c http.c file.c
@@ -32,7 +32,7 @@ httperr.h: ${LIBFETCHDIR}/http.errors ${LIBFETCHDIR}/errlist.sh
 	${HOST_SH} ${LIBFETCHDIR}/errlist.sh http_errlist HTTP \
 	    ${LIBFETCHDIR}/http.errors > ${.TARGET}
 
-.if ${MKSANITIZER:Uno} == "yes"
+.if ${MKSANITIZER:Uno} == "yes" || ${MKLIBCSANITIZER:Uno} == "yes"
 CFLAGS+=	-Wno-macro-redefined # _REENTRANT redefined
 .endif
 
diff --git a/external/gpl2/lvm2/lvm2tools.mk b/external/gpl2/lvm2/lvm2tools.mk
index aaca8c7e0458..ff04b2a8b0b4 100644
--- a/external/gpl2/lvm2/lvm2tools.mk
+++ b/external/gpl2/lvm2/lvm2tools.mk
@@ -1,4 +1,4 @@
-#	$NetBSD: lvm2tools.mk,v 1.5 2019/08/27 22:48:53 kamil Exp $
+#	$NetBSD: lvm2tools.mk,v 1.6 2020/02/08 00:11:18 kamil Exp $
 
 .include <bsd.own.mk>
 
@@ -25,6 +25,6 @@ CPPFLAGS+=-DDM_DEVICE_UID=0 -DDM_DEVICE_GID=5 -DDM_DEVICE_MODE=0640 \
 #
 #LVM2.liblvm=	${LVM2OBJDIR.liblvm}/liblvm.a
 
-.if ${MKSANITIZER:Uno} == "yes"
+.if ${MKSANITIZER:Uno} == "yes" || ${MKLIBCSANITIZER:Uno} == "yes"
 CFLAGS+=	-Wno-macro-redefined # _REENTRANT redefined in lib.h
 .endif
diff --git a/tests/lib/libc/net/Makefile b/tests/lib/libc/net/Makefile
index cabd62bc1d3a..da639530bdc2 100644
--- a/tests/lib/libc/net/Makefile
+++ b/tests/lib/libc/net/Makefile
@@ -1,4 +1,4 @@
-# $NetBSD: Makefile,v 1.12 2019/08/27 22:48:53 kamil Exp $
+# $NetBSD: Makefile,v 1.13 2020/02/08 00:11:18 kamil Exp $
 
 .include <bsd.own.mk>
 
@@ -41,7 +41,7 @@ LDADD.h_nsd_recurse+=	-lpthread
 
 CLEANFILES+=	aton_ether_subr.c
 
-.if ${MKSANITIZER:Uno} == "yes"
+.if ${MKSANITIZER:Uno} == "yes" || ${MKLIBCSANITIZER:Uno} == "yes"
 COPTS.h_nsd_recurse.c+=	-Wno-macro-redefined # _REENTRANT redefined
 .endif